What are the best practices for passing variables between PHP scripts using buttons or links?

When passing variables between PHP scripts using buttons or links, it is best practice to use either GET or POST methods. GET method appends the variables to the URL, while POST method sends the variables in the HTTP request body. To securely pass sensitive information, it is recommended to use POST method. 

// Sending variables using GET method
<a href="script.php?variable=value">Link</a>

// Receiving variables in script.php
$variable = $_GET['variable'];

// Sending variables using POST method
<form action="script.php" method="post">
    <input type="hidden" name="variable" value="value">
    <button type="submit">Submit</button>
</form>

// Receiving variables in script.php
$variable = $_POST['variable'];

Keywords

POST method GET method session variables form submission URL parameters

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